142526221 has 4 divisors (see below), whose sum is σ = 142930332. Its totient is φ = 142122112.

The previous prime is 142526207. The next prime is 142526233. The reversal of 142526221 is 122625241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122625241 = 4013 ⋅30557.

It can be written as a sum of positive squares in 2 ways, for example, as 95452900 + 47073321 = 9770^2 + 6861^2 .

It is a cyclic number.

It is not a de Polignac number, because 142526221 - 2²³ = 134137613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142526261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201526 + ... + 202231.

It is an arithmetic number, because the mean of its divisors is an integer number (35732583).

Almost surely, 2^142526221 is an apocalyptic number.

It is an amenable number.

142526221 is a deficient number, since it is larger than the sum of its proper divisors (404111).

142526221 is an equidigital number, since it uses as much as digits as its factorization.

142526221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404110.

The product of its digits is 1920, while the sum is 25.

The square root of 142526221 is about 11938.4346126282. The cubic root of 142526221 is about 522.3539984152.

The spelling of 142526221 in words is "one hundred forty-two million, five hundred twenty-six thousand, two hundred twenty-one".